/*
 * Copyright (C) 2023 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */

package vip.justlive.oxygen.core.util.eventbus;

import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
import lombok.RequiredArgsConstructor;
import vip.justlive.oxygen.core.util.concurrent.RepeatRunnable;
import vip.justlive.oxygen.core.util.concurrent.ThreadUtils;

/**
 * 内存队列事件分发器
 *
 * @author wubo
 */
public class InMemQueueDispatcher extends ImmediateDispatcher {

  private final BlockingQueue<EventWrapper> queue = new LinkedBlockingQueue<>();

  public InMemQueueDispatcher() {
    ThreadUtils.globalPool().execute(new RepeatRunnable("IMQDispatcher", this::run));
  }

  @Override
  public void dispatch(String channel, Object event) {
    queue.add(new EventWrapper(channel, event));
  }

  private void run() {
    EventWrapper eventWrapper = null;
    try {
      eventWrapper = queue.poll(1, TimeUnit.SECONDS);
    } catch (InterruptedException e) {
      Thread.currentThread().interrupt();
    }

    if (eventWrapper != null) {
      super.dispatch(eventWrapper.channel, eventWrapper.event);
    }
  }

  @RequiredArgsConstructor
  private static class EventWrapper {

    final String channel;
    final Object event;
  }
}
